A slider is needed control the LOD pop-ins. It's a very easy solution to implement that will make all happy

[marccreal]

There is a wishlist thread for this:

Slider to adjust/disable the scenery culling (reduce panning pop-in and stutters)

Sim Update 5 brought some huge CPU performance and RAM consumption benefits by culling the scenery not visible in the player’s current view. However, it means that panning the camera quickly or switching views can cause frame drops or stutters, and some obvious terrain morphing and object/photogrammetry pop-in. To many this is an acceptable compromise for better performance, but for some people this is too much of a trade-off, especially for those with high-end computers that are not interested…